Sphecoidea of Nebraska 75 
1893. Trypoxylon albitarse Fox, Proc. Acad. Nat. Sc. Phil., p. 474. 
1908. Trypoxylon albitarse H. S. Smith, Univ. Nesr. Struptes, VIII, 
/g5a) 
1912. Kine politum Rohwer, Proc. U. S. Nat. Mus., XLI, p. 
473. 
Males 4, females 4: Nebraska City (3) and Lincoln (5). 
Bred from nests; Lincoln specimens emerged in March; Ne- 
braska City specimens emerged May 25 and June 1. 
Trypoxylon albipilosum Fox. 
1891. Trypoxylon albopilosum Fox, Trans. Amer. Ent. Soc., XVIII, 
p. 139. 
1893. Trypoxylon albipilosum Fox, Proc. Acad. Nat. Sc. Phil., p. 474. 
Males 2, females 1: Omaha (3); June 26 to July 15. 
Trypoxylon clavatum Say. 
1837. Trypoxylon clavatus Say, Bost. Journ. Nat. Hist., I, Pt. 4, p. 
374- 
1893. Trypoxylon clavatum Fox, Proc. Acad. Nat. Sc. Phil., p. 474. 
Males 6, females 2: Omaha (8) ; July 8 to August 17. 
Trypoxylon frigidum F. Smith. 
1856. Trypoxylon frigidum F. Smith, Cat. Hym. Brit. Mus., IV, p. 
381. 
1893. Trypoxylon frigidum Fox, Proc. Acad. Nat. Sc. Phil., p. 474. 
Females 6: Omaha (5) and Warbonnet Canyon (1); July 20 
to August 25. 
Trypoxylon rubrocinctum Packard. 
1867. Trypoxylon rubrocinctum Packard, Proc. Ent. Soc. Phil., VI, 
p. 416. 
1893. Trypoxylon rubrocinctum Fox, Proc. Acad. Nat. Sc. Phil., p. 
474. 
Males 2, females 1: Lincoln (3); July 17 to August 3. 
Trypoxylon tridentatum Packard. 
1867. Trypoxylon tridentatum Packard, Proc. Ent. Soc. Phil., VI, p. 
417. 
1893. Trypoxylon tridentatum Fox, Proc. Acad. Nat. Sc. Phil., p. 475. 
Males 6, females 6: Omaha (3), Glen (8) and Monroe Canyon 
(1) ; July 14 to August 20; visits flowers of Chamaecrista fascic- 
ulata. 
393 
